Its exactly that. A slight hamstring strain. My theory.....its the weather. LA is a lot hotter and more humid than So. Cal. I remember watching a lot of Dolphin and Hurricane football games in which the opposing teams would, over the course of the game, start cramping up from the heat and humidity. I don't think he is very used to this kind of weather. Add to that the fact that he probably hasn't been exercising as much since his college season ended.

I think it's a 'contract injury'. He wants to be in camp, for positive publicity reasons. But he doesn't want to get injured before signing anything. So he fakes a minor injury to keep off the feild. It's happened with other big name players.